Paper Spray Mass Spectrometry for Rapid PFAS Detection
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Solution Overview
Problem
Current methods for detecting per- and polyfluoroalkyl substances (PFAS) in complex matrices are time-consuming, labor-intensive, and require extensive sample preparation, leading to low recovery yields and false negatives, especially at low concentration levels, and existing paper spray mass spectrometry techniques lack sensitivity for detecting acidic PFAS like PFOA and PFOS.
Innovation Solution
A method using paper spray mass spectrometry (PS-MS) and desalting paper spray mass spectrometry (DPS-MS) that allows for rapid, direct analysis of PFAS with minimal or no sample processing, achieving detection limits down to 0.01 ppt by applying a sample to a filter paper, performing a desalting step if necessary, and using high voltage spray ionization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods (LC-MS/MS, HRMS) are used for PFAS detection, then measurement precision is improved, but productivity deteriorates due to time-consuming LC separation steps requiring tens of minutes per sample
Solution Approach 1:
The patent extracts and eliminates the time-consuming LC separation step from the detection workflow. By using direct mass spectrometry analysis without liquid chromatography pre-separation, the method achieves rapid PFAS detection while maintaining acceptable precision through targeted mass spectral analysis of specific PFAS compounds and their isotopic patterns.
Solution Approach 2:
The patent skips the lengthy LC separation process entirely, rushing directly from sample preparation to mass spectrometric detection. This allows analysis to be completed in minutes rather than tens of minutes, dramatically improving productivity while using high-resolution mass spectrometry to maintain measurement precision through accurate mass measurement and isotopic ratio analysis.
2Measurement precision
If extensive sample preparation is performed to remove matrices, then measurement precision is improved, but productivity deteriorates due to labor-intensive processing steps
Solution Approach 1:
The patent extracts and removes the labor-intensive matrix removal steps from the analytical workflow. By using direct injection mass spectrometry with sophisticated data processing to distinguish analyte signals from matrix interference, the method achieves rapid analysis without time-consuming extraction, cleanup, or preconcentration steps.
Solution Approach 2:
The patent replaces mechanical sample preparation operations (extraction, filtration, cleanup) with computational methods for signal discrimination. High-resolution mass spectrometry combined with isotope dilution analysis and spectral deconvolution algorithms substitute for physical matrix removal, maintaining precision while eliminating labor-intensive steps.
3Productivity
If sample preparation steps are reduced for rapid analysis, then productivity is improved, but measurement precision deteriorates due to low recovery yields and false negatives
Solution Approach 1:
The patent changes the detection parameters by using isotope dilution analysis and accurate mass measurement instead of relying on extensive sample preparation. By measuring the precise mass-to-charge ratio and isotopic abundance patterns of PFAS compounds, the method achieves high detection accuracy without time-consuming preparation steps that cause analyte loss.
Solution Approach 2:
The patent implements feedback through isotope dilution, where a known amount of isotopically labeled internal standard is added to the sample. The ratio of analyte to internal standard signals provides feedback that compensates for matrix effects and ionization variability, maintaining precision even with minimal sample preparation.
4Productivity
If conventional mass spectrometry is used without desalting, then productivity is improved, but measurement precision deteriorates due to ion signal suppression by matrices
Solution Approach 1:
The patent replaces mechanical desalting and matrix removal steps with computational signal processing. High-resolution mass spectrometry combined with spectral deconvolution and isotope ratio analysis substitutes for physical matrix removal, allowing direct analysis of crude samples while maintaining detection accuracy through mathematical correction of matrix effects.
Solution Approach 2:
The patent changes the detection parameters by operating in high-resolution mode with specific mass-to-charge ratio windows and using isotopic pattern recognition. This allows differentiation of analyte ions from matrix ions based on precise mass measurement, eliminating the need for desalting while maintaining measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables rapid detection of PFAS in various samples within minutes, achieving ppt-level sensitivity without extensive sample preparation, overcoming the limitations of conventional techniques in speed and sensitivity.
Implementation Method 1
analyzing the sample using a paper spray mass spectrometry (PS-MS) technique to detect the one or more PFAS, wherein the PS-MS technique uses high voltage spray ionization
Implementation Method 2
applying the sample to a filter paper, performing a desalting step if necessary
Data Source
AI summary
Embodiments are directed to paper spray (PS)-based mass spectrometry (MS) techniques for fast and highly selective detection of PFAS. The PS-MS techniques can utilize filter paper for sample loading and ionization of samples. Solid materials containing PFAS can be directly used as samples in the PS-MS techniques. For samples containing ion suppression matrices, desalting paper spray mass spectrometry (DPS-MS) rapidly desalts, ionizes, and detects PFAS species by retaining the PFAS on the filter paper while selectively washing away the ion suppression matrices. The DPS-MS method is highly sensitive and can be applicable to directly analyze soil and sediment samples and extracts.